STM32MP2 Hantro VPU V4L2 H.264/VP8 Encoding & Decoding Usage Inquiry

[SullyNiu]

Product:

• MCU/SoC: STM32MP2

Description:
In our ST Linux environment, the hantro-vpu driver registers:

/dev/video5 -> VDEC (H.264/VP8 Decoder)
/dev/video6 -> VENC (H.264/VP8 Encoder)

We want to implement direct V4L2 API usage for H.264/VP8 encoding and decoding, without using GStreamer.

Specific Questions:

1.  Are there official minimal examples or demos using pure V4L2 API for H.264 / VP8 encoding/decoding?
2. DMA Usage: Is it possible to use DMA for input/output buffers in V4L2 mem2mem mode on STM32MP2 Hantro VPU? If yes, what is the recommended configuration and constraints?

[Jean-Christophe_TROTIN]

Hi @SullyNiu ,

There are no official examples or demos using pure V4L2 API for H.264/VP8 encoding/decoding delivered by STMicroelectronics.

The wiki page https://wiki.st.com/stm32mpu/wiki/V4L2_video_codec_overview just highlights in its chapter “2.2. APIs description” the official Video for Linux API especially https://www.kernel.org/doc/html/v6.6/userspace-api/media/v4l/v4l2.html in which there are some examples of API usage.

https://www.kernel.org/doc/html/v6.6/userspace-api/media/v4l/dev-stateless-decoder.html is also interesting but I assume that you already know this documentation.

However, hope this information helps.

Regards,

JC.